21709 Sethmurray
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| Discovery A | |
|---|---|
| Discoverer | LINEAR |
| Discovery date | September 7, 1999 |
| Alternate designations B |
1974 HF2; 1984 GG1; 1994 AA2; 1999 RK92 |
| Category | Main belt |
| Orbital elements C | |
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| Eccentricity (e) | 0.091 |
| Semi-major axis (a) | 337.985 Gm (2.259 AU) |
| Perihelion (q) | 307.193 Gm (2.053 AU) |
| Aphelion (Q) | 368.777 Gm (2.465 AU) |
| Orbital period (P) | 1240.385 d (3.40 a) |
| Mean orbital speed | 19.77 km/s |
| Inclination (i) | 6.068° |
| Longitude of the ascending node (Ω) |
357.119° |
| Argument of perihelion (ω) |
144.420° |
| Mean anomaly (M) | 163.805° |
| Physical characteristics D | |
| Dimensions | ? km |
| Mass | ?×10? kg |
| Density | ? g/cm³ |
| Surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | ? d |
| Spectral class | ? |
| Absolute magnitude | 14.4 |
| Albedo (geometric) | 0.1? |
| Mean surface temperature |
~185 K |
21709 Sethmurray is an asteroid. It was discovered on September 7, 1999 by MIT's Lincoln Laboratory Near-Earth Asteroid Research program (LINEAR).
It was named after Seth A. Murray as a reward for placing second in the microbiology category at the 2005 Intel International Science and Engineering fair (ISEF) in Phoenix, Arizona.
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